1. Barskov, I.S., Leonova, T.B., and Shilovsky, O.P., Middle Permian cephalopods of the Volga-Ural region, Paleontol. J., 2014, vol. 48, no. 13, pp. 1331–1414.
2. Crick, R.E. and Sobolev, E.S., Perunautilus quadratus n. gen. et sp. (Cephalopoda, Nautilida) from the Triassic (Norian) of Central Peru, Palaeontographica Abt. A., 1994, vol. 233, pp. 161–167.
3. Flower, R.H. and Kummel, B.A., Classification of the Nautiloidea, J. Paleontol., 1950, vol. 24, no. 5, pp. 604–616.
4. Kruglov, M.V., Upper Permian nautilids in the basin of the Pinega and Kuloya rivers, Trudy Paleontol. Inst. Akad. Nauk SSSR, 1933, vol. 3, pp. 185–208.
5. Nautiloidea–Nautilida;B., Kummel,1964